Series 1 (2010)# Title Directed by Written by UK viewers(million) Share(%) Original air date1 "A Study in Pink" Paul McGuigan Steven Moffat 9.23[41] 28.5[42] 25 July 2010 (2010-07-25)The police investigate the deaths of a series of people who all appear to have committed suicide by taking a poisonous pill. They turn to their unofficial consultant, Sherlock Holmes, who deduces various elements pointing to a serial killer. Meanwhile, Sherlock Holmes is introduced to John Watson, and the pair immediately move into a flat in Baker Street. John Watson slowly gets to know and trust Holmes despite a police officer warning him that Holmes is a psychopath and will one day be responsible for murder. A man who calls himself "Sherlock Holmes' archenemy" kidnaps Watson and asks whether he'll spy on Holmes for money, but Watson refuses. After a series of incidents, the person responsible for the deaths, a taxicab driver, reveals that his victims took their own lives by playing a game of Russian roulette with two pills: one fatally poisonous, the other safe. Watson shoots the cabbie, who reveals as he dies that Moriarty masterminded the entire plan.

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2 "The Blind Banker" Euros Lyn Steve Thompson 8.07[41] 25.5[43] 1 August 2010 (2010-08-01)Holmes is hired by an old friend to investigate a mysterious break-in at a bank in the City. He discovers that symbols spray-painted onto an office wall are a coded message intended for an employee of the bank, who is later discovered dead in his flat. The next day, a journalist is killed and the same symbols are found nearby. Holmes and Watson follow a trail of clues that link the two dead men to a Chinese smuggling ring, who are trying to retrieve a valuable item that one of them stole. Holmes eventually cracks the coded message based on Suzhou numerals and a book cipher, but not before Watson and a female friend are kidnapped by the criminals. Holmes rescues Watson's friend but the leader of the gang escapes. After escaping, the leader of gang is in communication with her superior, who is identified by the initial "M". She is then shot by a sniper. 3 "The Great Game" Paul McGuigan Mark Gatiss 9.18[41][14] 31.3[45] 8 August 2010 (2010-08-08)Sherlock Holmes is commissioned by his brother Mycroft to investigate the suspicious death of a government employee who was working on a top-secret defence project: the Bruce-Partington Project.[44] After apparently rejecting the case and handing it over to Watson, Holmes begins to be taunted by a sinister criminal who puts his victims into explosive vests and sets Holmes deadlines to solve apparently unrelated cases, including a twenty-year-old cold case involving the shoes of a drowned boy, the disappearance of a businessman, the death of a TV personality and the death of a guard of an art gallery at the hands of an assassin called the Golem. As Holmes solves the cases, he finds that they are all linked. After clearing up the case of the civil servant that Mycroft offered him, Holmes tries to force his unseen adversary to reveal himself. Nearing the end of the episode there is a standoff between Holmes and "Jim Moriarty", who reveals that he is responsible for the crimes. In the final seconds of the episode Sherlock Holmes points his gun at a bomb on the floor.

Filming is currently in progress for a second series of three 90-minute episodes, initially due to air in late 2011.[46] However, a continuity announcement at the conclusion of series 1's repeat broadcast indicated that series 2 is now due to air in 2012. At the Kapow! 11 convention, Mark Gatiss confirmed that the three episodes would be based on the stories "A Scandal in Bohemia", The Hound of the Baskervilles and "The Final Problem" and that the writers for the episodes would be Moffat, Gatiss and Thompson respectively.[47] Gatiss explained, "We knew after having a successful first run that the natural order would be to do three of the most famous [stories]".[47] "There's the question of how to go out on a cliffhanger and then the thematic things of the three stories, where we were trying to get to and what Sherlock and John's relationship is a little further on. You can't just go back to: 'You have no emotions.' 'I don't care.' You've got to move on somewhere and make sure the other characters have something of a journey too."[47] Paul McGuigan has confirmed that he will be returning to direct two episodes of series two,[48][49] and Doctor Who director Toby Haynes has also announced he will be working on the series.[50] Filming began on 16 May 2011 and it ended on August 24th, with the BBC Press Office confirming details of the upcoming series, including the return of the main cast and production team. Sue Vertue will produce the first two episodes of the series and Elaine Cameron will produce the third. Vertue will receive an executive producer credit for this episode.[51] It has been announced that actor Russell Tovey will appear in "The Hounds of Baskerville"[52] and that Lara Pulver will portray Irene Adler.[53]# Title Directed by Written by UK viewers(million) Share(%) Original air date1 "A Scandal in Belgravia"[51] Paul McGuigan Steven Moffat 20122 "The Hounds of Baskerville"[51] Paul McGuigan Mark Gatiss 20123 "The Reichenbach Fall"[51] Toby Haynes Steve Thompson 2012